Brush-holder.



PATENTED PEBE 25, 1908.

2 SHEETS-SHB ET l.

L Q" M314.

PATENTED FEB. 25, A1908 A. BALL;-

BRUSH HOLDER.

vAPPLICATION FILED NOV. 30. 1906.

2 SHEETS-SHEET 2.

MliZn/esses [nven Z 02: 42% FM Q. M. by HM Ziylg.

- UNITED srArEsrArrnnr onnion- ALBERT BALL, or oLAREMoNr, NEWnAnPsnIaEjAssIeNoR TO SULLIVAN MACHINERY COMPANY, or OLAREMONT, NEWHAMPSHIRE, A CORPORATION or MAINE.

BRUSH-HOLDER.

No. esoaev.

Specification of Letters Patent.

Patented Feb. 25, 1908.

Application filed November 30. 1906- Sarial No. 346,686.

' 'To all whom it may concern:

of the United States, residing atClaremont,

, I dynamos of various types.

holder is adapted for general use in connection. with electric -motorsor dynamos used lor variouspurposes and in various relations,

in no sense limited thereto.

Be itknown that I, ALBERT BALr a citizen in the county of Sullivan andState of New Ha1npshire,'have invented an Improvement in Brush-Holders,of which the following descrip tion, in connection with theaccompanymgdrawings, is a-spemficatromhke letters on the drawings representing likeparts.

This invention relates to brushholders for use in connection withelectric motors and \Vhile said brush the accompanying drawings,wherein,-

Figure 1 is a vertical central sectional view of a motor frame, a brushholder supporting ring, and means for securing thesame in properposition upon said frame; Fig. 2 is an end elevation of the mechanismshown in Fig. 1; and, Fig. 3 is a longitudinal central sectionrepresenting the brush holder" as applied to a motor employed upon anelectrically driven mining machine.

Referring to that specific embodiment of the invention disclosed inthedrawings, the

motor frame, which may be of am desired type, is represented at 1.purposes and as showing one manner of contemplated use of the invention,I have herein indicated the motor frame as supported upon a flat bottomplate or shoe 2, of a mining machine. In the specific type of mechanismreferred to and hereln indicated, the ma chine is caused to slide alongthe mine botengagement with a fixed fee-d chain having anchored ends inaccordance with the gen eral principles disclosed in U. S. patent toMitchell No. 656,414. It is ap arent, how

ever, that the brush holder may e employed.

upon mining machines of any suitable type,

For illustrative machines: I

The motor employed may be of .any desired type.

as Well as upon machinesothen-than mining cured to the motor frame and amotorshaft '4, mountedin suitable journals in sa'idframe,

the said shaft in :the present instance having a beveled gear 5 thereon,adapted through suitable connections to operate the cutting or othermechanism of the mining .machine in any preferred manner. IVhile the.motor frame may be of anysuitable construction, it is herein shownashavin at one endan encircling easing 6, andas aving secured .to

the edge of an adjacent portion-ofthe framing, the brush sup ortingmechanism fembodying one type 0 my invention, it .being apparent thatsaid brush supporting mech anism may be suitably supported upon any Inthe present constructioniI have herein represented field magnets 3,.se

desired part, so that the brushes may be- I brought into the desiredrelation to the coinmutator.

Referring particularly to Figs. 1 and 2 upon the annular edge or face ofthe motor frame 1, is secured a base ring 7, in any desired manner, asfor example by clamping screws 8, engaging in the present instance anannular flange 9, at the base of said. ring,

which, as herein shown 'is turned or formed to provide an annular Way ortrack 10, where in is received for rotation the brush holding ring 11,secured therein in any suitable manner, as by gib plates. To said ringis secured in the present instance, in any suitable manner, a wooden orother non-metallic ring 12, upon which the brushes 13., are suitablymounted, so as to be properly positioned with respect to the commutator.It is desirable to have free and ready access to the brushes forexamination or repair, and yet it is essential that the brushes bemaintained in sub stanti ally exact working relation, so that the motormay be operated withoutsparking, In many types of inechanismit isdiiiicult or impossible to obtain accessto the brushes when in operativeposition, and hence it be comes necessary to shift the support for'thebrushes to obtain access thereto. After such shifting it may be a matterof considerable difficulty to return said brushes to their properposition of adiustment. Heretofore, while brushes have been mounted sothat brush supporting device of my invention,

they may be withdrawn from operative position for repair andexamination, they have not been'somounted that convenient access may behad thereto and yet they maybe readily and quickly returned to exactpredetermined position. In the class of mechanism with which Ihave-shown a type of the bottom plate or shoe 2, is customarily solocated with reference to the brush supportmg ring 1 1, mounted in aplane normal thereto, that abrush supported at or near the lower ortionof the ring is very difficult .of access, because of the proximity ofsaid bottom plate or shoe, and moreover the entire mechanism may be inuse so positioned that access may readily be had only at a singlepart ofthe mechanism, as, for example, the upper part of the ring 11, viewingFig. 3. By rotating said rin 11, each of the brushes 13 may, in turn ebrought into position for ready examination, wherever desired. Were nomeans provided for determining the proper adjusted position of thebrushes 13, and the ring 11 supporting the same, after each suchexamination of the brushes it would be necessary carefully to re-adjustor determine precisely the position of the brushes' This would be amatter involving the expenditure of considerable time and involvingskill and judgment. In order that the brushes may readily be returned toproper position, I have provided the ring 11 with brushpositionestablishing provisions, whereby the same may be secured inpredetermined position and have provided cooperating means upon a memberwith respect to which said ring 11 rotates. In thepresent type of theinvention the said ring is provided with a socket 14, adapted to receivethe end of a set screw 15, herein shown as mounted in an overhangingportion of the ring 7. The socket 14 is formed in a predeterminedportion of the ring 11, which is determined after proper experiment.When the set screw 15 is screwed into its socket, the brushes 13 aremaintained in pro er operative position. When it is desire to have readyaccess to the brushes for any urpose the set screw 15- may be sufficienty unscrewed to permit rotation of said ring 11, which may be readilyreturned to its proper position, so that the said set screw and socketmay be brought into register. It is apparent that within the scope of myinvention other means may be employed by me to accomplish this result.

In assembling the mechanism the inner ring 11, carrying the brushholder, is positioned in the base ring 7, and secured therein by the setscrew 15. Said rings are then rotated as an entirety until the said setscrew is at a point of convenient access and the brushes are brought tothe correct position. The set screws 8, securing the base ring 7 to themotor frame, permit the fine adjustment of the brushes relative to .thecommutator and when this position has been determined,

the said set screws 8 are made fast and no further adjustment of thebase ring 7 is gen erally necessitated, inasmuch as the inner ring 11 isalways returned'to the same relative position with-respect to said basering 11. in the manner previously described.

Having thus disclosed one ty e or embodiment of the invention, I wis 1it to be understood that although specific terms are used, they .areemployed in a generic or do scriptive sense merely and not for purposesof limitation, the scope of the invention being set forth in thefollowing claims.

Claim.

1. A brush mechanism for electric motors or the like com I rising amotor frame, a base support rotata ly mounted upon the said frame, andmeans to secure the same in any desired position of circumferentialadjustment, whereby the brushes may be adjusted to a non-sparkingposition, a rotatable brush supporting. ring sustained by said basesupport with capacity for rotative adjustment, brushes supportedthereby, and cooperating securing provisions upon said base support andsaid ring for maintaining said brush supiporting rin in a predeterminedposition 0 rotative ar justnient.

2. A brush mechanism for electric motors or the like comprising a motorframe, a base ring rotatably mounted upon said frame, and means tosecure the same in any desired position of circumferential adjustment,whereby the brushes may be adjusted to a non-sparking position, arotatable brush suiporting ring sustained by said base ring withcapacity for rotative adjustment brushes supported thereby, andcooperating securing provisons upon said respective rings formaintaining said brush supporting ring in a predetermined position ofrotative adjustment.

3. A brush lnechanism for electric motors means to secure the same inany desired position of rotative adjustment, whereby a non-sparkingposition may be secured, a rotatable brush sup orting ring sustained bysaid base ring witi capacity for rotative adjustment, brushes supportedthereby, a locking device carried by one of said rings and cooperatingprovisions upon the other ring so located that when brought intoregister with the locking device the brushes are maintained in pro orposition.

4. A brush mec anism for electric motors or the like comprising a motorframe, a base ring secured thereto, means to secure said base ring inany desired position of rotative adjustment to secure non-sparking, arotatable brush supporting ring sustained b said base ring with capacityfor rotative {LL justment, brushes supported,thereby, a set sec/i ringhaving a set screw receiving socket se located that when brought into redeter with said set screw the brushes are maintained in proper osition.

5. A rushmechanism for electric motors 01' the like comprising a motorframe, a base ring rotatably mounted upon said frame,

said ring being circuniferentially adjustable to a non-sparlnngposition, means to secure 1 said ring .111 such nonsparking position, a

rotatable brush sup orting ring sustained by said base ring witrcapacity for rotative adjustment with reference thereto, brushessupported thereby, a locking device carried by one of said rings, andcooperating cro- 'VlSlOIlS upon the other ring, so located that whenbrought into register with the locking device the brushesare maintainedin proper position.

6. A brush mechanism for electric motors or thelihe comprising a motorframe, a base ring rotatably mounted u on the said frame, said ringbeing freely an circumferentially adjustable, whereby the ring may besecured in a non-sparking position, set screws securing said base ringinv such position, a rota table brush supporting ring sustained by thebase ring with capacity for rotative adjustment relative thereto,brushes supported thereby, a locking device carried by one of saidrings, and cooperating provisions upon the other ring so located thatwhen brought into register with the locking deirice the brushes aremaintained in proper position.

in testimony whereof, l have signed my name to this/ specification, inthe presence of two subscribing witnesses.

ALBERT BALL. i i itnesses LEE'A. KNIGH S, JAMES A. BRUCE.

